Noncircular hole driller attachment



Oct. 10, 1939. B. WOODS 2,175,546

NONCIRCULAR HOLE DRILLER ATTACHMENT Filed Oct. 11, 1937 AiiorneysPatented Oct. 10, 1939 UNITED STATES PATENT OFFICE NONCIRGULAR HOLEDRILLER ATTACHMENT 1 Claim.

This invention relates to an attachment for a drill for makingnon-circular holes, the general object of the invention being to providea guide for the bit which causes the bit to make the hole of anon-circular shape desired and yieldable means for holding the guideagainst the work piece, so that it is not necessary to connect the guidewith the work piece, with means for supporting the guide in a movablemanner from the casing.

This invention also consists in certain other features of constructionand in the combination and arrangement of several parts, to behereinafter fully described, illustrated in the accompanying drawing andspecifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to theaccompanying drawing wherein like characters denote like orcorresponding parts throughout the several views, and in which:

Figure l is an elevation of a device for drilling a non-circular hole,with the invention applied thereto.

Figure 2 is a bottom plan view of Figure 1.

Figure 3 is a section on the line 3-3 of Figure 2.

In this drawing the numeral I indicates the casing of the drillingdevice which may be of the type shown in the patent to H. J. Watts No.1,540,- 826 dated June 9, 1925 or any other suitable type, wherein thebit 9 has lateral movement to a certain extent when the device isoperated by the shaft 5. In such devices guiding means are provided forthe bit to cause the same to drill a hole of any desired non-circularshape in cross section and it is the object of my invention to provideimproved means for so guiding the bit. Such means includes a supportingmember or disk Ill having a socket therein for receiving a guidingbushing II which guides the bit in its movement to form a hole of thesame shape as that contained in the bushing. For instance by having thebushing provided with a square hole the bit will drill a square hole ina work piece or by having the bushing of hexagonal shape the bit willmake a hexagonal hole in the work piece. The bushing I I is removablyheld in the supporting member ID by a screw I2 passing through a hole I3in the member l0. Bars l4 are connected at their lower ends to oppositesides of the member III by the bolts l5 and the upper ends of these barshave the longitudinally extending slots [6 therein for receiving thebolts ll projecting from the sides of the casing I. A spring [8 has oneend fitting over the collar 3 of the casing l and its other end over acollar IS on the member I0, said spring tending to press the member l0away from the casing and thus this spring acts to hold the "member IDwith the bushing H therein against the work piece, thus avoiding thenecessity of fastening the member ID to the work piece. This manner ofslidingly connecting the member ID with the casing of the drillingdevice and providing a spring for yieldingly holding the member Illagainst the work piece enables a workman to turn out work much fasterthan where it was necessary to fasten the bushing carrying member to thework piece.

In order to use the invention on a device of the type shown in thebefore mentioned patent to H. J. Watts the casing l contains all themovable parts which are rotated by the shaft 5, and in order to hold thecasing stationary during the operation of the device a handle 20 isattached to the casing and extends at right angles therefrom so as toenable the workman to hold the casing against movement during thedrilling operation. The device can be used for drilling any machineablematerial, such as brass, copper, bronze, steel, etc.

Having described the invention, what is claimed as new is:

In a drill device for drilling non-circular holes and including acasing, a rotary member in the casing, a bit connected with the rotarymember and depending from the casing and a shaft extending into thecasing and connected with. the rotary member for rotating the same, awork engaging member of considerable area and having its lower face flatfor engaging the work and said work engaging member having a socket inits lower part and an opening extending from the top of the member tothe upper end of the socket for receiving the lower portion of the bit,said socket having an enlarged lower end, a bushing seated in the socketand having a non-circular hole therein for receiving the lower end ofthe bit for guiding the bit, said work engaging member having a flangeat its lower end fitting in the enlarged part of the socket with thelower face of the bushing flush with the lower face of the work engagingmember, means for removably holding the bushing in the socket, barshaving their lower ends connected with the work engaging member andhaving elongated longitudinally extending slots in their upper portions,bolts passing through the slots into the casing of the drill device, theupper face of the work engaging member having an annular centrallyarranged projection thereon, a spring having one end fitting around saidprojection and its upper end engaging the lower end of the casing of thedrill device for holding the work engaging member against a work pieceand a laterally extending handle connected with the casing for holdingthe casing stationary during the operation of the device.

BERNARD ALBERT WOODS.

